题记

接着feign的热乎劲，就顺便把dubbo一起复习一下吧

上代码

准备提供接口类的服务

• 整好服务

• 写好接口类

public interface StudentDubboApi {

    DubboUserInfo getInfo();
}

teacher作为消费者调用dubbo

• pom引入dubbo-api的接口类

<!--引入dubbo的统一api-->
```xml
<dependency>
    <groupId>org.apache.dubbo</groupId>
    <artifactId>dubbo-registry-nacos</artifactId>
    <version>2.7.15</version>
</dependency>

<dependency>
    <groupId>org.apache.dubbo</groupId>
    <artifactId>dubbo-spring-boot-starter</artifactId>
    <version>2.7.15</version>
</dependency>

• application.yml增加dubbo的配置

dubbo:
  application:
    name: teacher-dubbo
  registry:
    address: nacos://${spring.cloud.nacos.discovery.server-addr}
  protocol:
    name: dubbo # 指定通信协议
    port: 20880 # 通信端口  这里指的是与消费者间的通信协议与端口
  provider:
    timeout: 10000 # 配置全局调用服务超时时间
    retries: 3 # 重试3次
    delay: -1

• 启动类添加 @EnableDubbo
• 编写消费者，新版dubbo的reference已经过时，采用DubboReference

import org.apache.dubbo.config.annotation.DubboReference;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping
public class TeacherDubboService {

    @DubboReference(check = false)
    private StudentDubboApi studentDubboApi;

    @GetMapping("getDubbo")
    public DubboUserInfo testGetInfo(){

       return studentDubboApi.getInfo();
    }
}

student作为生产者

• 快速引入相同pom

<dependency>
    <groupId>org.apache.dubbo</groupId>
    <artifactId>dubbo-registry-nacos</artifactId>
    <version>2.7.15</version>
</dependency>

<dependency>
    <groupId>org.apache.dubbo</groupId>
    <artifactId>dubbo-spring-boot-starter</artifactId>
    <version>2.7.15</version>
</dependency>

<!--引入dubbo的统一api-->
<dependency>
    <groupId>ccom.example.com</groupId>
    <artifactId>dubbo-api</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <scope>compile</scope>
</dependency>

• 启动类添加@EnableDubbo
• 新建生产者的类

import com.example.demo.handdle.StudentDubboApi;
import com.example.demo.model.DubboUserInfo;
import org.apache.dubbo.config.annotation.DubboService;

@DubboService
public class StudentProduct implements StudentDubboApi {
    @Override
    public DubboUserInfo getInfo() {
        DubboUserInfo userInfo = new DubboUserInfo();
        userInfo.setAge(250);
        userInfo.setLike("I LIKE JAVA");
        userInfo.setName("my name is bongbong");
        return userInfo;
    }
}

• application.yml 添加配置

server:
  port: 8081
spring:
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
        cluster-name: sh
        namespace: 20c0e599-919c-483a-a3d7-c73eaf3b4e7c
        ephemeral: false
      config:
        file-extension: yaml
        server-addr: 127.0.0.1:8848
        namespace: 20c0e599-919c-483a-a3d7-c73eaf3b4e7c
        shared-configs:
          - dataId: common.yaml
  application:
    name: sutdent
  profiles:
    active: test     
        
dubbo:
  application:
    name: student-dubbo
  registry:
    address: nacos://${spring.cloud.nacos.discovery.server-addr}
  protocol:
    name: dubbo # 指定通信协议
    port: 20881 # 通信端口  这里指的是与消费者间的通信协议与端口
  provider:
    timeout: 10000 # 配置全局调用服务超时时间
    retries: 3 # 重试3次
    delay: -1

访问teacher的接口http://127.0.0.1:8082/getDubbo

为了方便大家不晕，我再截个图

版本对应表

Spring Cloud Alibaba Version	Sentinel Version	Nacos Version	RocketMQ Version	Dubbo Version	Seata Version
2021.0.1.0*	1.8.3	1.4.2	4.9.2	2.7.15	1.4.2
2.2.7.RELEASE	1.8.1	2.0.3	4.6.1	2.7.13	1.3.0
2.2.6.RELEASE	1.8.1	1.4.2	4.4.0	2.7.8	1.3.0
2021.1 or 2.2.5.RELEASE or 2.1.4.RELEASE or 2.0.4.RELEASE	1.8.0	1.4.1	4.4.0	2.7.8	1.3.0
2.2.3.RELEASE or 2.1.3.RELEASE or 2.0.3.RELEASE	1.8.0	1.3.3	4.4.0	2.7.8	1.3.0
2.2.1.RELEASE or 2.1.2.RELEASE or 2.0.2.RELEASE	1.7.1	1.2.1	4.4.0	2.7.6	1.2.0
2.2.0.RELEASE	1.7.1	1.1.4	4.4.0	2.7.4.1	1.0.0
2.1.1.RELEASE or 2.0.1.RELEASE or 1.5.1.RELEASE	1.7.0	1.1.4	4.4.0	2.7.3	0.9.0
2.1.0.RELEASE or 2.0.0.RELEASE or 1.5.0.RELEASE	1.6.3	1.1.1	4.4.0	2.7.3	0.7.1

技术债务

1.bootstrap.yml突然失效了，肯定是依赖问题，后续找到了我把解决贴过来

2.配置全局不检查依赖，否则服务之间启动的先后顺序会影响是否成功

写作不易，看到这里还请点个赞~